Would this be a fair reason to be upset with your partner?

My boyfriend and I have been together for 4 years with 2 babies under 2. He has a friend that he knows from high school (so probably 2 years before me?) and I feel like she just uses him, really. My boyfriend is a car guy and I notice she either never responds or gives him short answers until she needs him to work on her car, asks him to buy her car parts, if he has extra car decal/decor she can have, etc. With empty threats to pay him for it. Then she will blow up his phone, texting, calling, and will even tell him “you need to tell me in the next hour”. But I know that the whole “deadline” thing is only because she wants it done right then and there because she’ll text him later and say “what about now?” or she’ll even text him late in the night and ask if he’ll be up. KNOWINGGG he has to get up early for work and has two kids. She did this today and then even told him “How are you not gonna text back?” Like 🥴 how fucking TACKYYYYY.

I tried to hint once a while ago that she’s (very clearly) using him and that she’s not. But he still helps her somewhat commonly and any time I find out about it, I feel like almost like mad about it? Like why would you want to spend any extra time you have out of work helping someone who’s clearly using you when you could be with your girlfriend and young kids? (A lot of people said before that maybe there’s more to it, but I’m confident that isn’t the case because she’s trans and my boyfriend isn’t romantically or sexually interested in trans women)